[The study of anatomic factors in difficult intubations]

Area of Science:

• Anesthesiology
• Critical Care Medicine

Context:

• Endotracheal intubation is a routine anesthesia procedure.
• Unexpected difficulty poses significant patient risk.
• Pre-operative prediction of difficult airways is crucial for safe management.

Purpose:

• To analyze the incidence, anatomic factors, complications, and management of difficult intubations.
• To correlate laryngoscopic views with difficult airway cases using Cormack and Lehane grading.

Summary:

• A 1-year study of 3925 patients found a 2.3% incidence of difficult endotracheal intubation (92 cases).
• The majority of difficult intubations (44.6%) were associated with two or more anatomic factors.
• Common factors included short neck (48.9%), protruding teeth (38.0%), receding mandible (27.2%), and limited mouth opening (26.1%).
• Most cases (89%) were graded as Cormack and Lehane grade 3.
• Frequent complications were tachycardia/hypertension (70.7%), bleeding (37.0%), and esophageal intubation (33.7%).

Impact:

• Provides data on difficult intubation incidence and contributing factors.
• Highlights common complications associated with difficult airways.
• Informs pre-operative assessment and anesthetic planning for challenging intubations.